EP0468440A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Organic electroluminescent device with stabilized cathode
Assignee: Eastman Kodak Co
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Filing: 1991-07-23
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Granted: —
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Expires: 2011-07-23
Abstract
Abstract An organic electroluminescent device (100) is disclosed which is protected from dark spot formation. The device is comprised of, in sequence, a support (102), an anode (104), an organic electroluminescent medium (106), and a cathode (118). The cathode (118) contains a plurality of metals, at least one of which is a low work function metal other than an alkali metal. Overlying the cathode (118) is a protective layer (122) comprised of a mixture of at least one organic component of the organic electroluminescent medium and at least one metal having a work function in the range of from 4.0 to 4.5 eV capable of being oxidized in the presence of ambient moisture. <IMAGE>
Inventors
- 👤 Steven Arland Eastman Kodak Company Van Slyke
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 05:17
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/02; H05B33/04; H05B33/12; H05B33/14; H05B33/26; H10; H10K; H10K50/00; H10K50/80; H10K50/805; H10K50/82; H10K50/826; H10K50/84; H10K50/844; H10K50/846; H10K59/00; H10K59/80; H10K59/805; H10K59/8052; H10K59/80523; H10K59/87; H10K59/873; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
An organic electroluminescent device comprising in sequence, a support, an anode, an organic electroluminescent medium, and a cathode, characterized in that said cathode is comprised of a layer consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function of less than 4 eV, and, overlying said cathode, a protective layer comprised of a mixture of at least one organic component of said organic electroluminescent medium and at least one metal having a work function in the range of from 4.0 to 4.5 eV capable of being oxidized in the presence of ambient moisture.
Claim 2
Dependent Claim
104 words
An organic electroluminescent device comprising in sequence, a support, an anode, an organic electroluminescent medium, and a cathode, characterized in that said cathode is comprised of a layer consisting essentially of a plurality of metals other than alkali metals, at least one of said metals having a work function of less than 4 eV, and, overlying said cathode, a protective layer comprised of a mixture of at least one organic component of said organic electroluminescent medium and at least one metal having a work function in the range of from 4.0 to 4.5 eV capable of being oxidized in the presence of ambient moisture.
Claim 3
Dependent Claim
17 words
An organic electroluminescent device according to claim 1 further characterized in that said anode is light transmissive.
Claim 4
Dependent Claim
26 words
An organic electroluminescent device according to claim 1 or 2 further characterized in that said organic electroluminescent medium includes an organic electron injecting and transporting zone.
Claim 5
Dependent Claim
28 words
An organic electroluminescent device according to claim 3 further characterized in that said organic electron injecting and transporting zone is comprised of a stilbene or chelated oxinoid compound.
Claim 6
Dependent Claim
35 words
An organic electroluminescent device according to claim 3 or 4 further characterized in that at least one said organic component of said protective layer is also present in said organic electron injecting and transporting zone.
Claim 7
Dependent Claim
29 words
An organic electroluminescent device according to any one of claims 1 to 5 inclusive further characterized in that said organic electroluminescent medium includes a hole injecting and transporting zone.
Claim 8
Dependent Claim
25 words
An organic electroluminescent device according to claim 6 further characterized in that said hole injecting and transporting zone includes at least one aromatic tertiary amine.
Claim 9
Dependent Claim
24 words
An organic electroluminescent device according to claim 6 further characterized in that said hole injecting and transporting zone includes at least one porphorinic compound.
Claim 10
Dependent Claim
32 words
An organic electroluminescent device according to claim 6 further characterized in that least one said organic component of said protective layer is also present in said organic hole injecting and transporting zone.
Claim 11
Dependent Claim
28 words
An organic electroluminescent device according to any one of claims 1 to 9 inclusive further characterized in that said protective layer has a thickness of at least 200A.
Claim 12
Dependent Claim
29 words
An organic electroluminescent device according to any one of claims 1 to 10 inclusive further characterized in that said protective layer has a thickness of up to 5 µm.
Claim 13
Dependent Claim
27 words
An organic electroluminescent device according to claim 11 further characterized in that said protective layer has a thickness in the range of from 500A to 2 µm.
Claim 14
Dependent Claim
41 words
An organic electroluminescent device according to any one of claims 1 to 12 inclusive further characterized in that said metal present in said protective layer accounts for 20 to 90 percent by weight of said protective layer, based on total weight.
Claim 15
Dependent Claim
35 words
An organic electroluminescent device according to claim 13 further characterized in that said metal present in said protective layer accounts for 30 to 80 percent by weight of said protective layer, based on total weight.
References Cited (Backward Citations)
No citation records indexed.
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